Readout electronics for CSR-ETF silicon strip array detector system

A readout electronics has been developed for the silicon strip array detector system of HIRFL-CSR-ETF.It consists of 48 front end electronics(FEE)boards,12 PXI-DAQ boards and one trigger board.It can implement energy and time measurements of 4608 channels.Each FEE board is based on 6 ASICs(ATHED),which implements energy and time measurements of 96 channels.The PXI-DAQ board meets requirements of high-speed counting and amount of readout channels and can process signals of 4 FEEs.The trigger board is developed to select the valid events.The energy linearity of the readout electronics is better than 0.3%in the dynamic range of 0.1-0.7V.In the test with a standard triple alpha source,the energy resolution was 1.8%at 5.48 MeV.This readout electronics enables the silicon strip array system to identify particles of A<14.

Design of a Novel Front-End Readout ASIC for PET Imaging System

The architecture of a multi-channel front-end system is important for realizing a high-resolution PET system. We propose a novel front-end readout electronic system with TDC to deal with time information for PET system which can easily design the timing control. Each channel consists of a charge preamplifier, slow/fast shaper, discriminator and an analog memory. There are an ADC and a TDC to process the energy information and time information for each channel at the same time. In this paper, the whole system signals flow is all simulated by MATLAB. The simulation results show that the proposed system can process slender current from the detector and achieve the energy and time information. The proposed architecture can be applied to high-resolution PET imaging systems with multi-channel ASICs.

Development of front-end readout electronics for silicon strip detectors

Front-end readout electronics have been developed for silicon strip detectors at our institute. In this system an Application Specific Integrated Circuit （ASIC） ATHED is used to realize multi-channel energy and time measurements. The slow control of ASIC chips is achieved by parallel port and the timing control signals of ASIC chips are implemented with the CPLD. The data acquisition is carried out with a PXI-DAQ card. The software has a user-friendly GUI developed with LabWindows/CVI in the Windows XP operating system. The test results show that the energy resolution is about 1.14% for alpha at 5.48 MeV and the maximum channel crosstalk of the system is 4.60%. The performance of the system is very reliable and is suitable for nuclear physics experiments.

新型电荷-频率转换电路设计

设计了一种用于兰州重离子治癌系统中剂量监测的新型电荷-频率转换电路。该电路将输入的电流信号直接转换为脉冲输出,通过计数器对脉冲个数进行计数实现对输入电荷的测量,从而实现对照射剂量的实时监测。实验表明:该电路可实现0.01 n A^1μA范围内双极性电流的测量,在整个测量范围内线性度好于2.71%。

Design of fast adaptive readout system for wire scanners

A new wide-range fast readout system capable of adaptive identification is designed for wire scanners,which are used to measure beam profiles and emittance.This system is capable of handling varying current signals with Gaussian distributions and current pulses up to 1000 counts/s, as well as an input current range of 1 n A–1 m A. When tested, the resolution was found to exceed 3.68% for full scale, the nonlinearity was found to be less than 0.11%, and the measurement sensibility was found to be less than 5 p A. We believe that the system will play a crucial role in improving the measurement accuracy of beam diagnosis and the efficiency of accelerator operation,as well as decreasing the time required for beam tuning.This system was applied to the beam diagnosis of an injector II prototype for an accelerator-driven subcritical system and produced excellent measurement results. A description of the adaptive fast readout system for wire scanners is presented in this paper.

核电子学在空间科学探测领域的应用

21世纪以来,随着科学技术的进步和对宇宙探索的不懈追求,我国成功发射了多颗空间科学卫星和深空探测载荷。在这些空间科学卫星或搭载的科学仪器中,核与粒子探测器发挥着至关重要的作用。核电子学作为探测器的重要组成部分,其功能涵盖前端信号放大读出、数字化、触发判选与处理等多个环节。空间科学探测中的核电子学除满足探测器在高分辨率、大动态范围、精确粒子鉴别和数据压缩等方面的需求,同时还须符合空间环境下的抗辐照、高可靠性和长寿命等工程要求。本文通过回顾核电子学在我国空间探测领域的应用,希望为核电子学技术在空间科学领域的进一步发展提供参考和见解。论文分析了几个空间科学任务中的核电子学设计方案,包括暗物质粒子探测卫星(Dark Matter Particle Explorer,DAMPE)、硬X射线调制望远镜(Hard X-ray Modulation Telescope,HXMT)、引力波暴高能电磁对应体全天监测器卫星(Gravitational Wave High-energy Electromagnetic Counterpart All-sky Monitor, GECAM)、天问一号(Tianwen-1)、先进天基太阳天文台(Advanced Space-based Solar Observatory, ASO-S)和爱因斯坦探针卫星(Einstein Probe,EP)等。在此基础上,本文进一步探讨了核电子学技术对于实现空间探测科学目标的重要性及其面临的挑战,包括创新性、空间环境适应能力等方面,并对未来的发展方向进行了展望。核电子学是核与粒子探测的核心技术,在空间科学任务中,核电子学系统除必须满足对探测器信号进行精密读出等所需要达到的电性能参数方面的要求,还要确保在太空特殊环境中的长期可靠性。此外,随着科学目标的拓展和提升,空间探测任务对核电子学的数据处理和传输能力也提出了更高的要求。同时,受益于新材料、先进工艺和人工智能等技术的发展,未来的核电子学系统有望更紧凑、可靠和智能化。核电子学的持续发展有望为实现更高水平的空间科学探测提供强有力的支持,推动对宇宙空间的更深度探索。

用于新型塑料闪烁体阵列探测器的多通道前端读出电子学设计

介绍一种用于新型塑料闪烁体阵列探测器系统的前端读出电子学(FEE)的设计与实现,该前端读出电子学主要基于电荷测量专用的集成电路(ASIC)芯片和现场可编程逻辑门阵列(FPGA)研制,可实现对多路探测器信号的采集、处理、筛选、打包,并通过LVDS差分接口上传到后端的数据获取系统(DAQ)。同时,该电路设有板载线性标定电路,可实现对各通道电子学性能刻度,设有电源电流、关键芯片及电路温度实时监控等电路,使电路具有较完善的功能和较强的自我保护能力。

PET成像前端读出芯片研究进展

在过去的半个多世纪里,虽然正电子发射断层(PET)成像设备在外型上没有多大变化,但在技术和方法上发生了多次革命性的飞跃。微电子技术在PET成像领域的应用将进一步推动PET向更小体积、更高性能、更低成本等方向发展。从PET系统成像原理出发,详细综述了PET前端读出芯片技术的研究进展。将PET探测器信号的前端读出和信号处理分为光电转换、信号采集、脉冲高度分析、峰值探测和保持、信号数字化和数字信号处理等环节,给出了各个环节的微电子电路实现。然后,描述了PET前端读出大规模专用集成电路的研发进展,指出采用数字电路的方法来处理探测器前端读出和模拟信号处理已经成为PET前端电子的发展趋势,而且集成PET专用DSP的多通道智能前端读出电路已经成为一个重要的方向。

Development of a multi-channel readout ASIC for a fast neutron spectrometer based on GEM-TPC

A multi-channel front-end ASIC has been developed for a fast neutron spectrometer based on Gas Electron Multiplier （GEM）-Time Projection Chamber （TPC）. Charge Amplifier and Shaping Amplifier for GEM （CASAGEM） integrates 16＋1 channels： 16 channels for anodes and 1 channel for cathode. The gain and the shaping time are adjustable from 2 to 40 mV/fC and from 20 to 80 ns, respectively. The prototype ASIC is fabricated in 0.35 μm CMOS process. An evaluation Print Circuit Board （PCB） was also developed for chip tests. In total 20 chips have been tested. The integrated nonlinearity is less than 1%. The equivalent noise electrons is less than 2000e when the input capacitor is 50 pF. The time jitter is less than 1 ns. The design and the test results are presented in the paper.

高计数率多通道时间测量与串行读出电路研制

近年来应用于中高能核物理实验的先进前端读出专用集成电路(application specific integrated circuit,ASIC)芯片呈现出越来越强的数字化趋势,可提高系统的集成度并降低功耗。论文研制了一种高计数率多通道时间测量与串行读出电路(high-count rate multi-channel time measurement and serial readout circuit,HMTRC),可实现核事件去稀疏化、去随机化的读出。该电路主要包括了基于时钟分相技术的时间数字转化器、控制器、先进先出存储器和基于令牌环逻辑的轮询读出模块。HMTRC已被集成到一款自研的16通道前端读出ASIC芯片中,可测量和储存时间信息,并利用数字驱动的前端读出架构实现时间与能量信息同步读出。测试表明,时间分辨率好于2 ns,功能符合预期。